Thailand’s Princess Sirivannavari Nariratana waves to crowd as she cycles in the “Bike for Dad” event in Bangkok, Thailand, on Friday. Thai Crown Prince Maha Vajiralongkorn led thousand of cyclists on a 29-km course in Bangkok to celebrate King Bhumibol Adulyadej’s 88th birthday

Dutch King Willem-Alexander, Queen Maxima and their daugthers (L-R) Crown Princess Catharina-Amalia, Princess Alexia and Princess Ariane wave on the balcony after the abdication ceremony of the King’s mother at the Royal Palace Amsterdam, The Netherlands, on Tuesday. Royal Highness Princess Beatrix of the Netherlands in an official ceremony on Tuesday signed her abdication to leave the Dutch throne to her eldest son Willem-Alexander.